Formulate the recursive formula for the following geometric sequence.
{-16, 4, -1, } show all your work : )

step-by-step explanation:

180°

step-by-step explanation:

sum of equilateral triangle=180°

< n=60°

< m=120°°[angle supplementary of equilateral angle]

< m+< r+< x=360°(sum of exterior angle of triangle)

you would 18 *0.25 = 4.5